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As Bojack is forced to attend an underwater movie festival to promote his new movie, a series of events and the inability to communicate with underwater life ensures that not everything goes as planned.

Diane crashes at BoJack's place after quitting her job following Sebastian St. Clair, which puts a strain on BoJack and Wanda's relationship. Todd joins an improv comedy troupe which turns out to be a cult.

BoJack, Kelsey, Todd, Princess Carolyn, and Mr. Peanutbutter attempt to shoot a crucial scene in the Secretariat movie that was not in the script. Princess Carolyn and Diane contemplate their respective careers.

A publishing house eagerly awaits BoJack's memoirs, but he hasn't even started yet. His agent/ex and his publisher try to talk him into working with a ghost writer, but BoJack's too despondent about being washed up to focus.